diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 933771b0b07a..e2c2f1516c26 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -125,8 +125,8 @@ config S390
 	select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 	select ARCH_WANTS_NO_INSTR
 	select ARCH_WANT_DEFAULT_BPF_JIT
-	select ARCH_WANT_IPC_PARSE_VERSION
 	select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
+	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_TABLE_SORT
 	select CLONE_BACKWARDS2
 	select DMA_OPS if PCI
@@ -187,7 +187,6 @@ config S390
 	select HAVE_KPROBES
 	select HAVE_KPROBES_ON_FTRACE
 	select HAVE_KRETPROBES
-	select HAVE_RETHOOK
 	select HAVE_KVM
 	select HAVE_LIVEPATCH
 	select HAVE_MEMBLOCK_PHYS_MAP
@@ -200,6 +199,7 @@ config S390
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RELIABLE_STACKTRACE
+	select HAVE_RETHOOK
 	select HAVE_RSEQ
 	select HAVE_SAMPLE_FTRACE_DIRECT
 	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
@@ -210,9 +210,9 @@ config S390
 	select HAVE_VIRT_CPU_ACCOUNTING_IDLE
 	select IOMMU_HELPER		if PCI
 	select IOMMU_SUPPORT		if PCI
+	select MMU_GATHER_MERGE_VMAS
 	select MMU_GATHER_NO_GATHER
 	select MMU_GATHER_RCU_TABLE_FREE
-	select MMU_GATHER_MERGE_VMAS
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE	if PCI
 	select NEED_PER_CPU_EMBED_FIRST_CHUNK
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 47a397da0498..cebd4ca16916 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -52,6 +52,8 @@ targets += vmlinux.bin.zst info.bin syms.bin vmlinux.syms $(obj-all)
 OBJECTS := $(addprefix $(obj)/,$(obj-y))
 OBJECTS_ALL := $(addprefix $(obj)/,$(obj-all))
 
+clean-files += vmlinux.map
+
 quiet_cmd_section_cmp = SECTCMP $*
 define cmd_section_cmp
 	s1=`$(OBJDUMP) -t -j "$*" "$<" | sort | \
@@ -71,7 +73,7 @@ $(obj)/bzImage: $(obj)/vmlinux $(obj)/section_cmp.boot.data $(obj)/section_cmp.b
 $(obj)/section_cmp%: vmlinux $(obj)/vmlinux FORCE
 	$(call if_changed,section_cmp)
 
-LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup --build-id=sha1 -T
+LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup $(if $(CONFIG_VMLINUX_MAP),-Map=$(obj)/vmlinux.map) --build-id=sha1 -T
 $(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS_ALL) FORCE
 	$(call if_changed,ld)
 
diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index 57a2d6518d27..c699f251a464 100644
--- a/arch/s390/include/asm/ap.h
+++ b/arch/s390/include/asm/ap.h
@@ -49,6 +49,19 @@ struct ap_queue_status {
 	unsigned int _pad2		: 16;
 };
 
+/*
+ * AP queue status reg union to access the reg1
+ * register with the lower 32 bits comprising the
+ * ap queue status.
+ */
+union ap_queue_status_reg {
+	unsigned long value;
+	struct {
+		u32 _pad;
+		struct ap_queue_status status;
+	};
+};
+
 /**
  * ap_intructions_available() - Test if AP instructions are available.
  *
@@ -82,7 +95,7 @@ static inline bool ap_instructions_available(void)
  */
 static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info)
 {
-	struct ap_queue_status reg1;
+	union ap_queue_status_reg reg1;
 	unsigned long reg2;
 
 	asm volatile(
@@ -91,12 +104,12 @@ static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info)
 		"	.insn	rre,0xb2af0000,0,0\n"	/* PQAP(TAPQ) */
 		"	lgr	%[reg1],1\n"		/* gr1 (status) into reg1 */
 		"	lgr	%[reg2],2\n"		/* gr2 into reg2 */
-		: [reg1] "=&d" (reg1), [reg2] "=&d" (reg2)
+		: [reg1] "=&d" (reg1.value), [reg2] "=&d" (reg2)
 		: [qid] "d" (qid)
 		: "cc", "0", "1", "2");
 	if (info)
 		*info = reg2;
-	return reg1;
+	return reg1.status;
 }
 
 /**
@@ -125,16 +138,16 @@ static inline struct ap_queue_status ap_test_queue(ap_qid_t qid,
 static inline struct ap_queue_status ap_rapq(ap_qid_t qid)
 {
 	unsigned long reg0 = qid | (1UL << 24);  /* fc 1UL is RAPQ */
-	struct ap_queue_status reg1;
+	union ap_queue_status_reg reg1;
 
 	asm volatile(
 		"	lgr	0,%[reg0]\n"		/* qid arg into gr0 */
 		"	.insn	rre,0xb2af0000,0,0\n"	/* PQAP(RAPQ) */
 		"	lgr	%[reg1],1\n"		/* gr1 (status) into reg1 */
-		: [reg1] "=&d" (reg1)
+		: [reg1] "=&d" (reg1.value)
 		: [reg0] "d" (reg0)
 		: "cc", "0", "1");
-	return reg1;
+	return reg1.status;
 }
 
 /**
@@ -146,16 +159,16 @@ static inline struct ap_queue_status ap_rapq(ap_qid_t qid)
 static inline struct ap_queue_status ap_zapq(ap_qid_t qid)
 {
 	unsigned long reg0 = qid | (2UL << 24);  /* fc 2UL is ZAPQ */
-	struct ap_queue_status reg1;
+	union ap_queue_status_reg reg1;
 
 	asm volatile(
 		"	lgr	0,%[reg0]\n"		/* qid arg into gr0 */
 		"	.insn	rre,0xb2af0000,0,0\n"	/* PQAP(ZAPQ) */
 		"	lgr	%[reg1],1\n"		/* gr1 (status) into reg1 */
-		: [reg1] "=&d" (reg1)
+		: [reg1] "=&d" (reg1.value)
 		: [reg0] "d" (reg0)
 		: "cc", "0", "1");
-	return reg1;
+	return reg1.status;
 }
 
 /**
@@ -209,18 +222,21 @@ static inline int ap_qci(struct ap_config_info *config)
  * parameter to the PQAP(AQIC) instruction. For details please
  * see the AR documentation.
  */
-struct ap_qirq_ctrl {
-	unsigned int _res1 : 8;
-	unsigned int zone  : 8;	/* zone info */
-	unsigned int ir    : 1;	/* ir flag: enable (1) or disable (0) irq */
-	unsigned int _res2 : 4;
-	unsigned int gisc  : 3;	/* guest isc field */
-	unsigned int _res3 : 6;
-	unsigned int gf    : 2;	/* gisa format */
-	unsigned int _res4 : 1;
-	unsigned int gisa  : 27;	/* gisa origin */
-	unsigned int _res5 : 1;
-	unsigned int isc   : 3;	/* irq sub class */
+union ap_qirq_ctrl {
+	unsigned long value;
+	struct {
+		unsigned int	   : 8;
+		unsigned int zone  : 8;	/* zone info */
+		unsigned int ir	   : 1;	/* ir flag: enable (1) or disable (0) irq */
+		unsigned int	   : 4;
+		unsigned int gisc  : 3;	/* guest isc field */
+		unsigned int	   : 6;
+		unsigned int gf	   : 2;	/* gisa format */
+		unsigned int	   : 1;
+		unsigned int gisa  : 27;	/* gisa origin */
+		unsigned int	   : 1;
+		unsigned int isc   : 3;	/* irq sub class */
+	};
 };
 
 /**
@@ -232,21 +248,14 @@ struct ap_qirq_ctrl {
  * Returns AP queue status.
  */
 static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
-					     struct ap_qirq_ctrl qirqctrl,
+					     union ap_qirq_ctrl qirqctrl,
 					     phys_addr_t pa_ind)
 {
 	unsigned long reg0 = qid | (3UL << 24);  /* fc 3UL is AQIC */
-	union {
-		unsigned long value;
-		struct ap_qirq_ctrl qirqctrl;
-		struct {
-			u32 _pad;
-			struct ap_queue_status status;
-		};
-	} reg1;
+	union ap_queue_status_reg reg1;
 	unsigned long reg2 = pa_ind;
 
-	reg1.qirqctrl = qirqctrl;
+	reg1.value = qirqctrl.value;
 
 	asm volatile(
 		"	lgr	0,%[reg0]\n"		/* qid param into gr0 */
@@ -254,7 +263,7 @@ static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
 		"	lgr	2,%[reg2]\n"		/* ni addr into gr2 */
 		"	.insn	rre,0xb2af0000,0,0\n"	/* PQAP(AQIC) */
 		"	lgr	%[reg1],1\n"		/* gr1 (status) into reg1 */
-		: [reg1] "+&d" (reg1)
+		: [reg1] "+&d" (reg1.value)
 		: [reg0] "d" (reg0), [reg2] "d" (reg2)
 		: "cc", "memory", "0", "1", "2");
 
@@ -291,13 +300,7 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
 					     union ap_qact_ap_info *apinfo)
 {
 	unsigned long reg0 = qid | (5UL << 24) | ((ifbit & 0x01) << 22);
-	union {
-		unsigned long value;
-		struct {
-			u32 _pad;
-			struct ap_queue_status status;
-		};
-	} reg1;
+	union ap_queue_status_reg reg1;
 	unsigned long reg2;
 
 	reg1.value = apinfo->val;
@@ -308,7 +311,7 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
 		"	.insn	rre,0xb2af0000,0,0\n"	/* PQAP(QACT) */
 		"	lgr	%[reg1],1\n"		/* gr1 (status) into reg1 */
 		"	lgr	%[reg2],2\n"		/* qact out info into reg2 */
-		: [reg1] "+&d" (reg1), [reg2] "=&d" (reg2)
+		: [reg1] "+&d" (reg1.value), [reg2] "=&d" (reg2)
 		: [reg0] "d" (reg0)
 		: "cc", "0", "1", "2");
 	apinfo->val = reg2;
@@ -333,7 +336,7 @@ static inline struct ap_queue_status ap_nqap(ap_qid_t qid,
 {
 	unsigned long reg0 = qid | 0x40000000UL;  /* 0x4... is last msg part */
 	union register_pair nqap_r1, nqap_r2;
-	struct ap_queue_status reg1;
+	union ap_queue_status_reg reg1;
 
 	nqap_r1.even = (unsigned int)(psmid >> 32);
 	nqap_r1.odd  = psmid & 0xffffffff;
@@ -345,11 +348,11 @@ static inline struct ap_queue_status ap_nqap(ap_qid_t qid,
 		"0:	.insn	rre,0xb2ad0000,%[nqap_r1],%[nqap_r2]\n"
 		"	brc	2,0b\n"       /* handle partial completion */
 		"	lgr	%[reg1],1\n"  /* gr1 (status) into reg1 */
-		: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1),
+		: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1.value),
 		  [nqap_r2] "+&d" (nqap_r2.pair)
 		: [nqap_r1] "d" (nqap_r1.pair)
 		: "cc", "memory", "0", "1");
-	return reg1;
+	return reg1.status;
 }
 
 /**
@@ -389,7 +392,7 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
 					     unsigned long *resgr0)
 {
 	unsigned long reg0 = resgr0 && *resgr0 ? *resgr0 : qid | 0x80000000UL;
-	struct ap_queue_status reg1;
+	union ap_queue_status_reg reg1;
 	unsigned long reg2;
 	union register_pair rp1, rp2;
 
@@ -408,8 +411,9 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
 		"2:	lgr	%[reg0],0\n"   /* gr0 (qid + info) into reg0 */
 		"	lgr	%[reg1],1\n"   /* gr1 (status) into reg1 */
 		"	lgr	%[reg2],2\n"   /* gr2 (res length) into reg2 */
-		: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1), [reg2] "=&d" (reg2),
-		  [rp1] "+&d" (rp1.pair), [rp2] "+&d" (rp2.pair)
+		: [reg0] "+&d" (reg0), [reg1] "=&d" (reg1.value),
+		  [reg2] "=&d" (reg2), [rp1] "+&d" (rp1.pair),
+		  [rp2] "+&d" (rp2.pair)
 		:
 		: "cc", "memory", "0", "1", "2");
 
@@ -421,7 +425,7 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
 		 * Signal the caller that this dqap is only partially received
 		 * with a special status response code 0xFF and *resgr0 updated
 		 */
-		reg1.response_code = 0xFF;
+		reg1.status.response_code = 0xFF;
 		if (resgr0)
 			*resgr0 = reg0;
 	} else {
@@ -430,7 +434,7 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid,
 			*resgr0 = 0;
 	}
 
-	return reg1;
+	return reg1.status;
 }
 
 /*
diff --git a/arch/s390/include/asm/nmi.h b/arch/s390/include/asm/nmi.h
index af1cd3a6f406..227466ce9e41 100644
--- a/arch/s390/include/asm/nmi.h
+++ b/arch/s390/include/asm/nmi.h
@@ -101,9 +101,8 @@ void nmi_alloc_mcesa_early(u64 *mcesad);
 int nmi_alloc_mcesa(u64 *mcesad);
 void nmi_free_mcesa(u64 *mcesad);
 
-void s390_handle_mcck(struct pt_regs *regs);
-void __s390_handle_mcck(void);
-int s390_do_machine_check(struct pt_regs *regs);
+void s390_handle_mcck(void);
+void s390_do_machine_check(struct pt_regs *regs);
 
 #endif /* __ASSEMBLY__ */
 #endif /* _ASM_S390_NMI_H */
diff --git a/arch/s390/include/asm/rwonce.h b/arch/s390/include/asm/rwonce.h
new file mode 100644
index 000000000000..91fc24520e82
--- /dev/null
+++ b/arch/s390/include/asm/rwonce.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_S390_RWONCE_H
+#define __ASM_S390_RWONCE_H
+
+#include <linux/compiler_types.h>
+
+/*
+ * Use READ_ONCE_ALIGNED_128() for 128-bit block concurrent (atomic) read
+ * accesses. Note that x must be 128-bit aligned, otherwise a specification
+ * exception is generated.
+ */
+#define READ_ONCE_ALIGNED_128(x)			\
+({							\
+	union {						\
+		typeof(x) __x;				\
+		__uint128_t val;			\
+	} __u;						\
+							\
+	BUILD_BUG_ON(sizeof(x) != 16);			\
+	asm volatile(					\
+		"	lpq	%[val],%[_x]\n"		\
+		: [val] "=d" (__u.val)			\
+		: [_x] "QS" (x)				\
+		: "memory");				\
+	__u.__x;					\
+})
+
+#include <asm-generic/rwonce.h>
+
+#endif	/* __ASM_S390_RWONCE_H */
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 59eba19ae0f2..d26f02495636 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -36,6 +36,23 @@
 
 int __bootdata(is_full_image);
 
+#define decompressor_handled_param(param)			\
+static int __init ignore_decompressor_param_##param(char *s)	\
+{								\
+	return 0;						\
+}								\
+early_param(#param, ignore_decompressor_param_##param)
+
+decompressor_handled_param(mem);
+decompressor_handled_param(vmalloc);
+decompressor_handled_param(dfltcc);
+decompressor_handled_param(noexec);
+decompressor_handled_param(facilities);
+decompressor_handled_param(nokaslr);
+#if IS_ENABLED(CONFIG_KVM)
+decompressor_handled_param(prot_virt);
+#endif
+
 static void __init reset_tod_clock(void)
 {
 	union tod_clock clk;
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index c8d8c9960936..76a06f3d3671 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -562,16 +562,6 @@ ENTRY(mcck_int_handler)
 	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
 	lgr	%r2,%r11		# pass pointer to pt_regs
 	brasl	%r14,s390_do_machine_check
-	cghi	%r2,0
-	je	.Lmcck_return
-	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
-	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
-	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
-	la	%r11,STACK_FRAME_OVERHEAD(%r1)
-	lgr	%r2,%r11
-	lgr	%r15,%r1
-	brasl	%r14,s390_handle_mcck
-.Lmcck_return:
 	lctlg	%c1,%c1,__PT_CR1(%r11)
 	lmg	%r0,%r10,__PT_R0(%r11)
 	mvc	__LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 5e713f318de3..7b41ceecbb25 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -278,6 +278,7 @@ static void pop_kprobe(struct kprobe_ctlblk *kcb)
 {
 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
 	kcb->kprobe_status = kcb->prev_kprobe.status;
+	kcb->prev_kprobe.kp = NULL;
 }
 NOKPROBE_SYMBOL(pop_kprobe);
 
@@ -402,12 +403,11 @@ static int post_kprobe_handler(struct pt_regs *regs)
 	if (!p)
 		return 0;
 
+	resume_execution(p, regs);
 	if (kcb->kprobe_status != KPROBE_REENTER && p->post_handler) {
 		kcb->kprobe_status = KPROBE_HIT_SSDONE;
 		p->post_handler(p, regs, 0);
 	}
-
-	resume_execution(p, regs);
 	pop_kprobe(kcb);
 	preempt_enable_no_resched();
 
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 5dbf274719a9..38ec0487521c 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -156,7 +156,7 @@ NOKPROBE_SYMBOL(s390_handle_damage);
  * Main machine check handler function. Will be called with interrupts disabled
  * and machine checks enabled.
  */
-void __s390_handle_mcck(void)
+void s390_handle_mcck(void)
 {
 	struct mcck_struct mcck;
 
@@ -192,23 +192,16 @@ void __s390_handle_mcck(void)
 	if (mcck.stp_queue)
 		stp_queue_work();
 	if (mcck.kill_task) {
-		local_irq_enable();
 		printk(KERN_EMERG "mcck: Terminating task because of machine "
 		       "malfunction (code 0x%016lx).\n", mcck.mcck_code);
 		printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
 		       current->comm, current->pid);
-		make_task_dead(SIGSEGV);
+		if (is_global_init(current))
+			panic("mcck: Attempting to kill init!\n");
+		do_send_sig_info(SIGKILL, SEND_SIG_PRIV, current, PIDTYPE_PID);
 	}
 }
 
-void noinstr s390_handle_mcck(struct pt_regs *regs)
-{
-	trace_hardirqs_off();
-	pai_kernel_enter(regs);
-	__s390_handle_mcck();
-	pai_kernel_exit(regs);
-	trace_hardirqs_on();
-}
 /*
  * returns 0 if register contents could be validated
  * returns 1 otherwise
@@ -346,8 +339,7 @@ static void notrace s390_backup_mcck_info(struct pt_regs *regs)
 	struct sie_page *sie_page;
 
 	/* r14 contains the sie block, which was set in sie64a */
-	struct kvm_s390_sie_block *sie_block =
-			(struct kvm_s390_sie_block *) regs->gprs[14];
+	struct kvm_s390_sie_block *sie_block = phys_to_virt(regs->gprs[14]);
 
 	if (sie_block == NULL)
 		/* Something's seriously wrong, stop system. */
@@ -374,7 +366,7 @@ NOKPROBE_SYMBOL(s390_backup_mcck_info);
 /*
  * machine check handler.
  */
-int notrace s390_do_machine_check(struct pt_regs *regs)
+void notrace s390_do_machine_check(struct pt_regs *regs)
 {
 	static int ipd_count;
 	static DEFINE_SPINLOCK(ipd_lock);
@@ -504,16 +496,10 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
 	}
 	clear_cpu_flag(CIF_MCCK_GUEST);
 
-	if (user_mode(regs) && mcck_pending) {
-		irqentry_nmi_exit(regs, irq_state);
-		return 1;
-	}
-
 	if (mcck_pending)
 		schedule_mcck_handler();
 
 	irqentry_nmi_exit(regs, irq_state);
-	return 0;
 }
 NOKPROBE_SYMBOL(s390_do_machine_check);
 
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 79904a839fb9..e7b867e2f73f 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1355,8 +1355,7 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all)
 		num_sdb++;
 
 		/* Reset trailer (using compare-double-and-swap) */
-		/* READ_ONCE() 16 byte header */
-		prev.val = __cdsg(&te->header.val, 0, 0);
+		prev.val = READ_ONCE_ALIGNED_128(te->header.val);
 		do {
 			old.val = prev.val;
 			new.val = prev.val;
@@ -1558,8 +1557,7 @@ static bool aux_set_alert(struct aux_buffer *aux, unsigned long alert_index,
 	struct hws_trailer_entry *te;
 
 	te = aux_sdb_trailer(aux, alert_index);
-	/* READ_ONCE() 16 byte header */
-	prev.val = __cdsg(&te->header.val, 0, 0);
+	prev.val = READ_ONCE_ALIGNED_128(te->header.val);
 	do {
 		old.val = prev.val;
 		new.val = prev.val;
@@ -1637,8 +1635,7 @@ static bool aux_reset_buffer(struct aux_buffer *aux, unsigned long range,
 	idx_old = idx = aux->empty_mark + 1;
 	for (i = 0; i < range_scan; i++, idx++) {
 		te = aux_sdb_trailer(aux, idx);
-		/* READ_ONCE() 16 byte header */
-		prev.val = __cdsg(&te->header.val, 0, 0);
+		prev.val = READ_ONCE_ALIGNED_128(te->header.val);
 		do {
 			old.val = prev.val;
 			new.val = prev.val;
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 23c427284773..d4888453bbf8 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -333,6 +333,7 @@ static void pcpu_delegate(struct pcpu *pcpu,
 	}
 	/* Stop target cpu (if func returns this stops the current cpu). */
 	pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
+	pcpu_sigp_retry(pcpu, SIGP_CPU_RESET, 0);
 	/* Restart func on the target cpu and stop the current cpu. */
 	if (lc) {
 		lc->restart_stack = stack;
@@ -522,7 +523,7 @@ static void smp_handle_ext_call(void)
 	if (test_bit(ec_call_function_single, &bits))
 		generic_smp_call_function_single_interrupt();
 	if (test_bit(ec_mcck_pending, &bits))
-		__s390_handle_mcck();
+		s390_handle_mcck();
 	if (test_bit(ec_irq_work, &bits))
 		irq_work_run();
 }
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c
index 5060956b8e7d..1bc42ce26599 100644
--- a/arch/s390/mm/extmem.c
+++ b/arch/s390/mm/extmem.c
@@ -289,15 +289,17 @@ segment_overlaps_others (struct dcss_segment *seg)
 
 /*
  * real segment loading function, called from segment_load
+ * Must return either an error code < 0, or the segment type code >= 0
  */
 static int
 __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
 {
 	unsigned long start_addr, end_addr, dummy;
 	struct dcss_segment *seg;
-	int rc, diag_cc;
+	int rc, diag_cc, segtype;
 
 	start_addr = end_addr = 0;
+	segtype = -1;
 	seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
 	if (seg == NULL) {
 		rc = -ENOMEM;
@@ -326,9 +328,9 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
 	seg->res_name[8] = '\0';
 	strlcat(seg->res_name, " (DCSS)", sizeof(seg->res_name));
 	seg->res->name = seg->res_name;
-	rc = seg->vm_segtype;
-	if (rc == SEG_TYPE_SC ||
-	    ((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
+	segtype = seg->vm_segtype;
+	if (segtype == SEG_TYPE_SC ||
+	    ((segtype == SEG_TYPE_SR || segtype == SEG_TYPE_ER) && !do_nonshared))
 		seg->res->flags |= IORESOURCE_READONLY;
 
 	/* Check for overlapping resources before adding the mapping. */
@@ -386,7 +388,7 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
  out_free:
 	kfree(seg);
  out:
-	return rc;
+	return rc < 0 ? rc : segtype;
 }
 
 /*
diff --git a/drivers/s390/crypto/ap_queue.c b/drivers/s390/crypto/ap_queue.c
index a32457b4cbb8..2637fe1df727 100644
--- a/drivers/s390/crypto/ap_queue.c
+++ b/drivers/s390/crypto/ap_queue.c
@@ -29,8 +29,8 @@ static void __ap_flush_queue(struct ap_queue *aq);
  */
 static int ap_queue_enable_irq(struct ap_queue *aq, void *ind)
 {
+	union ap_qirq_ctrl qirqctrl = { .value = 0 };
 	struct ap_queue_status status;
-	struct ap_qirq_ctrl qirqctrl = { 0 };
 
 	qirqctrl.ir = 1;
 	qirqctrl.isc = AP_ISC;
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 28a36e016ea9..72e10abb103a 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -301,7 +301,7 @@ static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
  */
 static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
 {
-	struct ap_qirq_ctrl aqic_gisa = {};
+	union ap_qirq_ctrl aqic_gisa = { .value = 0 };
 	struct ap_queue_status status;
 	int retries = 5;
 
@@ -384,7 +384,7 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
 						 int isc,
 						 struct kvm_vcpu *vcpu)
 {
-	struct ap_qirq_ctrl aqic_gisa = {};
+	union ap_qirq_ctrl aqic_gisa = { .value = 0 };
 	struct ap_queue_status status = {};
 	struct kvm_s390_gisa *gisa;
 	struct page *h_page;
